Advances in Materials Research
Volume 6, Number 4, 2017, pages 343-348
DOI: 10.12989/amr.2017.6.4.343
Preparation of gas-atomized Fe-based alloy powders and HVOF sprayed coatings
Joseph Lik Hang Chau, Alfred I-Tsung Pan and Chih-Chao Yang
Abstract
High-pressure gas atomization was employed to prepare the Fe-based Fe<sub>50</sub>Cr<sub>24</sub>Mo<sub>21</sub>Si<sub>2</sub>B<sub>3</sub> alloy powder. The effect of flow rate of atomizing gas on the median powder diameter was studied. The results show that the powder size decreased with increasing the flow rate of atomizing gas. Fe-based alloy coatings with amorphous phase fraction was then prepared by high velocity oxygen fuel spraying (HVOF) of gas atomized Fe<sub>50</sub>Cr<sub>24</sub>Mo<sub>21</sub>Si<sub>2</sub>B<sub>3</sub> powder. Microstructural studies show that the coatings present dense layered structure and low porosity of 0.17% in about 200 <i>μ</i>m thickness. The Fe-based alloy coating exhibits an average hardness of about 1230 HV. Our results show that the HVOF process results in dense and well-bonded coatings, making it attractive for protective coatings applications.
Key Words
alloy; coatings; HVOF; gas atomization; powder
Address
(1) Joseph Lik Hang Chau, Chih-Chao Yang:
Materials and Chemical Research Laboratories, Industrial Technology Research Institute, Tainan City, Taiwan;
(2) Alfred I-Tsung Pan:
Strategy and R&D Plan Office, Industrial Technology Research Institute, Hsinchu, Taiwan.